Itenso.TimePeriod.TimePeriodCollection.ContainsPeriod C# (CSharp) Method

        public bool ContainsPeriod( ITimePeriod test )
        {
            if ( test == null )
            {
                throw new ArgumentNullException( "test" );
            }

            foreach ( ITimePeriod period in periods )
            {
                if ( period.IsSamePeriod( test ) )
                {
                    return true;
                }
            }
            return false;
        }

        public void ContainsPeriodTest()
        {
            DateTime now = ClockProxy.Clock.Now;
            SchoolDay schoolDay = new SchoolDay( now );
            TimePeriodCollection timePeriods = new TimePeriodCollection( schoolDay );

            TimeRange timeRange = new TimeRange( schoolDay.Lesson1.Start, schoolDay.Lesson1.End );
            Assert.IsFalse( timePeriods.Contains( timeRange ) );
            Assert.IsTrue( timePeriods.ContainsPeriod( timeRange ) );

            timePeriods.Add( timeRange );
            Assert.IsTrue( timePeriods.Contains( timeRange ) );
            Assert.IsTrue( timePeriods.ContainsPeriod( timeRange ) );
        }